Malicious PDF — malware analysis report

Static analysis result for SHA-256 347b9a4f4ccb3476…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 20:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad0e0f296c8048b09ca9f2ab152a7069 SHA-1: 845a79d7b7927fca1dd79261764c2372d779d58d SHA-256: 347b9a4f4ccb3476d2a712a064ac93ca4e33f034e658adf44a277ee2347272d5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to malicious URLs, which are designed as a link farm to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=thank+you+in+egyptian PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ecd17c29706630a43e04c098e5520c88/gelatiwopubofagesevuj.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/0fh99b0e0v9qob7h7tl3799pv5/lusuvabo.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/b72c51bb426a52da8e5ac142070089b8/53085615820.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/82717981005.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/razixafivi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2i89uf50oq8cfeim626hiervq1/53601812461.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/h7bumsdk8rr7v5lse0r1207bug/23501023235.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/mavevovakisajedalifosuvun.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd060da3e9f---poval.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/39366138042.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/negop.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/845b356451fe239aa72e529fc4e7cc88/monowebogurutefi.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-23/20210623004924345319.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/47937466931.pdfIn PDF document text
    • https://oferta.lt/i/File/15268677772.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/nogogupu.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/17543494036.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/26923870405.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/fakerunajuwekup.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/wozoxawad.pdfIn PDF document text
    • https://penal-garazh.ru/files/32159696171.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/774508a3e5b4ed19d46792f6935fae20/30416129581.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 10484 bytes
SHA-256: 4e4a522f98bc4cbafd5eaa8e0a0c37c617a9b53ddffb443deffb523fb8034929
font_02_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 21248 bytes
SHA-256: e4b30af93251b75a8ab8e4339112e6f6b397c439473155ca1b7d65d6fea9163c